ajax上传多数据到PHP怎么区分

上传第一个数据

url: "content/templates/Joe/doupload.php?action=upload1",
url: "content/templates/Joe/doupload.php?action=upload2",
url: "content/templates/Joe/doupload.php?action=upload3",

在后端怎么区分

 <?php
if ($action === 'upload1') {
upload1的操作
}
if ($action === 'upload2') {
upload2的操作
}
if ($action === 'upload3') {
upload3的操作
}
?>

已经解决了